linux-kernel - Re: [PATCH][resubmit] sched: minor optimizations in wake_affine and select_task_rq

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Date:	Tue, 30 Sep 2008 15:26:09 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, vatsa@...ux.vnet.ibm.com,
	a.p.zijlstra@...llo.nl
Subject: Re: [PATCH][resubmit] sched: minor optimizations in wake_affine
	and select_task_rq_fair


* Amit K. Arora <aarora@...ux.vnet.ibm.com> wrote:

> As mentioned in http://lkml.org/lkml/2008/9/30/141 , this is the new
> patch.
> 
> sched: Minor optimizations in wake_affine and select_task_rq_fair
> 
> This patch does following:
> o Removes unused variable and argument "rq".
> o Optimizes one of the "if" conditions in wake_affine() - i.e.  if
>   "balanced" is true, we need not do rest of the calculations in the
>   condition.
> o If this cpu is same as the previous cpu (on which woken up task
>   was running when it went to sleep), no need to call wake_affine at all.
> 
> Signed-off-by: Amit K Arora <aarora@...ux.vnet.ibm.com>
> CC: Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
> CC: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> CC: Ingo Molnar <mingo@...e.hu>

applied to tip/sched/devel, thanks Amit!

	Ingo
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